Ae cs4 limited to recognize only 3gb of ram?

i have ae cs4 instaled on a 32bits win vista with 8gb ram... but my ae only show recognizing 3gb of it. any one know this?

Elaine, your answer includes some items that are factually incorrect or misleading.
> After Effects is limited to a theoretical maximum of 3GB of RAM per core.
No. The theoretical maximum is 4GB per core.
"The operating system imposes certain limits on the amount of memory that an application can use. After Effects on the Mac OS X operating system can use up to 3.5 GB of RAM, although only about 3 GB is actually available to the foreground application, because Mac OS X uses approximately 500 MB to load the user interface libraries. After Effects on 32-bit Windows operating systems can use up to 3 GB of RAM; however, to use more than 2 GB in After Effects, you must configure Windows XP or Windows Vista appropriately.... After Effects on 64-bit Windows operating systems can use up to 4 GB of RAM with no special configuration."
(See "Memory usage and storage".)
Your use of the term "RAM cache" is also misleading. Whether you have Render Multiple Frames Simultaneously on or not, the foreground process stores frames for RAM preview in a RAM cache. There is not a separate "RAM cache" for each of the background processes.
Also, you tell this person to change their RAM cache setting to a certain percentage. The original poster is using After Effects CS4. Only After Effects CS3 and earlier have the RAM cache exposed s a percentage.
> If you have a machine with multiple processing cores and a 64-bit OS
you can enable Multiprocessing in After Effects's preferences.
The Render Multiple Frames Simultaneously feature is not dependent on a 64-bit operating system. Yes, it works much better on a 64-bit operating system, but you can see performace gains with only two processors on a 32-bit operating system.

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